Although there are ISO standards for dimensions, many carriers have moved away from standardised sizes for reasons of their own, some of which may be related to marketing promotion. This is mainly the consequence in the United States where containers can be 35 feet, 45 feet, 48 feet and 52 feet in length. The height of the containers is set by the ISO as 8 feet or 8 feet 6 inches, but there also“high-cube containers” have become the norm.